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Intermolecular forces are the interaction which are formed by the attraction of the two having opposite charges (partial positive and partial negative charge). The opposite charge are formed by the presence of the electron-negative atom in the molecule. Due to the presence of an electron-negative atom, there is an induced partial positive charge is generated on the electron-positive charge (or less electron-negative charge) atom. There will be an attraction between the both oppositely charges to form a bond.

Dipole-dipole Interaction: These interactions are the attractive forces which present in the polar molecules. Polar molecules have permanent dipoleswhich are produced by the presence of the opposite charge of the atom.

Ion-dipole interaction: These interactions are present in the ion and polar molecules. These interactions are similar to the dipole-dipole interaction.

London dispersion interaction: It is the weak bond which is formed for a short period of time. The bond is formed between the polar and non-polar molecules due to the phenomena of induction.

KCl: Chlorine is an electronegative atom as it belongs to halogen and potassium is a metal which is electropositive, which forms an ionic bond-forming cation and anion.

P₄ : Phosphorus is electronegative as it belongs to halogens, which form a non-polar molecule. The force of attraction between the atoms is the dispersion force which induced dipole force. The force is very weak.

BF₃: F-atom is the most electronegative atom which induces a dipole in B-atom. The intermolecular force between the molecules is dipole-dipole interaction.

SO₂: The difference between the electronegativity is large. The O-atom is electronegative and S-atom is less electronegative form the polar molecule. The intermolecular force between the molecules is dipole-dipole interaction.

Br₂ : Bromine is electronegative as it belongs to halogens, which form a non-polar molecule. The force of attraction between the atoms is the dispersion force which induced dipole force. The force is very weak.

NO₂: The difference between the electronegativity is large. The F-atom is most electronegative and S-atom is less electronegative form polar molecule. The intermolecular force between the molecules is dipole-dipole interaction. The intermolecular force between the molecules is dipole-dipole interaction.